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By Hollie Silverman
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A dangerous new development in the opioid crisis is raising alarms among federal law enforcement and public health officials, who warn that a potent mix of fentanyl and carfentanil emerging in the illicit drug supply may be far more difficult to reverse with standard lifesaving medications like Narcan.
The Drug Enforcement Administration (DEA) says the reemergence of carfentanil—a synthetic opioid so powerful it is used commercially as an elephant tranquilizer—is compounding the deadliness of the street drug supply, as traffickers increasingly blend it alongside fentanyl into counterfeit pills and powders.
Fentanyl is already established by the DEA and the Centers for Disease Control and Prevention (CDC) as the leading cause of death for Americans between the ages of 18 and 45. The addition of carfentanil introduces a substance that is 100 times more potent than fentanyl and 10,000 times stronger than morphine.
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"Because of this potency, even very small changes in the amount present in the drug supply can substantially increase overdose risk," Dr. Hawre Jalal, a professor of health economics at the University of Ottawa who studies opioid supply chains, previously told Newsweek.
The geographic footprint of the drug has widened significantly. DEA data shows the agency has detected carfentanil across 37 states, following a steep multiyear rise in fatalities. According to CDC data tracking the trend, six-month mortality figures surged sevenfold from 29 deaths in early 2023 to 238 deaths during the same period in 2024.
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A Growing Threat
Federal law enforcement officials characterize the return of carfentanil as a rapid escalation of the synthetic drug threat, with the substance appearing with greater frequency during narcotics seizures.
“I see a lot of fentanyl, but even more recently I've seen a lot of carfentanil in my samples; it's scary,” Alyssa Sanchez, a forensic chemist at the DEA’s Miami laboratory, told local station WPTV earlier this week. Sanchez noted that the drug cannot be identified visually, warning that illicit mixtures arrive in "any color of the rainbow, really."
The DEA’s regional hub in Miami is considered the busiest forensic drug laboratory in the country, largely due to its proximity to maritime smuggling routes from South America. Miles Aley, special agent in charge of the DEA's Miami Division, told the station neutralizing the combined fentanyl-carfentanil supply has become a top priority for the division.
Because carfentanil is frequently mixed into other narcotics without the buyer's knowledge, users are entirely unaware of the lethal margins they face.
"People using drugs may not know carfentanil is present, and accurate dosing in illicit markets is extremely difficult," Jalal previously told Newsweek.
Aley noted that the sheer chemical strength of the drug creates a highly volatile scenario for first responders and bystanders. "They're a different chemical compound [such] that they're immune to the effects of Narcan," Aley said of the high threshold required to counteract a carfentanil exposure. "It’s very concerning. There's no single quick answer to solve this problem, and it's going to take a lot of work by a lot of people."
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Why Narcan May Not Be Enough
Carfentanil was never intended for human consumption. A lethal dose of fentanyl is estimated at 2 milligrams, but a fatal amount of carfentanil is just 0.2 milligrams—an amount smaller than a single grain of salt.
Symptoms of exposure occur within minutes. They include severe respiratory depression or complete respiratory arrest, profound disorientation, pinpoint pupils, and cold, clammy skin.
Because the drug binds so heavily to opioid receptors in the brain, an overdose involving carfentanil—particularly when mixed with fentanyl—frequently overwhelms a standard single dose of naloxone, the opioid-reversal drug commonly known by the brand name Narcan. Emergency medical personnel often must administer multiple doses of naloxone in rapid succession to restore breathing, increasing the likelihood that an exposure becomes fatal before sufficient medical help arrives.
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Carfentanil’s Return Could Threaten Progress on Overdose Deaths
Health policy experts warn that the resurgence of carfentanil could threaten to erase recent progress made in reducing national overdose statistics.
Jalal said carfentanil’s return highlights how quickly illicit opioid markets can shift, driven by strong incentives to traffic highly potent, compact synthetic drugs. When supply chains are disrupted or traffickers respond to enforcement pressure, he said, “the market can shift rapidly,” leading to sudden changes in what substances appear on the street.
Jalal noted that global policy decisions can play a role in those shifts. China’s decision to classify carfentanil and related substances as controlled drugs in 2017 coincided with a sharp drop in carfentanil cases and related deaths in parts of the United States, particularly in states like Ohio and Michigan, where earlier outbreaks had been concentrated.
His research found that declines in those heavily impacted states accounted for much of the national drop in overdose deaths at the time, suggesting that changes in international supply chains can quickly ripple through local drug markets.
While that correlation does not prove direct causation, Jalal said it underscores a key concern: as conditions evolve again, carfentanil’s reappearance could reverse hard-won gains—especially if it spreads more widely in combination with fentanyl.
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Contact Newsweek editor for this story: Anthony Murray.
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